Fix launcher flash during secure camera transition.

Bug:7452928
Change-Id: I8b7d9bdb14addefb9e9ed71a45d438418b3e21dd

Author: John Spurlock

policy/src/com/android/internal/policy/impl/keyguard/KeyguardActivityLauncher.java

@@ -118,8 +118,7 @@ public void launchCamera() {
     public void launchActivity(final Intent intent, boolean showsWhileLocked, boolean animate) {
         final Context context = getContext();
         final Bundle animation = animate ? null :
-                ActivityOptions.makeCustomAnimation(context, com.android.internal.R.anim.fade_in,
-                        com.android.internal.R.anim.fade_out).toBundle();
+                ActivityOptions.makeCustomAnimation(context, 0, 0).toBundle();
         LockPatternUtils lockPatternUtils = getLockPatternUtils();
         intent.addFlags(
                 Intent.FLAG_ACTIVITY_NEW_TASK

policy/src/com/android/internal/policy/impl/keyguard/KeyguardHostView.java

@@ -824,7 +824,7 @@ private void addWidget(int appId, int pageIndex) {
             public void onLaunchingCamera() {
                 SlidingChallengeLayout slider = locateSlider();
                 if (slider != null) {
-                    slider.showHandle(false);
+                    slider.setHandleAlpha(0);
                 }
             }
 
@@ -835,7 +835,7 @@ public void onCameraLaunched() {
                 }
                 SlidingChallengeLayout slider = locateSlider();
                 if (slider != null) {
-                    slider.showHandle(true);
+                    slider.setHandleAlpha(1);
                     slider.showChallenge(true);
                 }
             }

policy/src/com/android/internal/policy/impl/keyguard/SlidingChallengeLayout.java

@@ -270,16 +270,9 @@ public SlidingChallengeLayout(Context context, AttributeSet attrs, int defStyle)
         setWillNotDraw(false);
     }
 
-    public void showHandle(boolean visible) {
-        if (visible) {
-            if (mHandleAnimation != null) {
-                mHandleAnimation.cancel();
-                mHandleAnimation = null;
-            }
-            mHandleAlpha = 1.f;
-            invalidate();
-        } else {
-            animateHandle(false);
+    public void setHandleAlpha(float alpha) {
+        if (mExpandChallengeView != null) {
+            mExpandChallengeView.setAlpha(alpha);
         }
     }